Returns undef if no singular form exists, otherwise returns the
singular form of the topic

I18N? - Only apply plural processing if site language is English, or
if a built-in English-language web (Main, TWiki or Plugins). Plurals
apply to names ending in 's', where topic doesn't exist with plural
name.

SMELL: this is highly langauge specific, and shoud be overridable
on a per-installation basis.

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